Infrared Sensor Light Absorption Layer Using Spherical Quantum Dots
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Solution Overview
Problem
Infrared sensors with quantum dots micro-processed into an island shape face complications in manufacturing, increased costs, and sensitivity variations.
Innovation Solution
The development of an infrared sensor with a light absorption layer containing spherical quantum dots, formed using a liquid-phase synthesis method, which simplifies the manufacturing process and enhances sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quantum dots are micro-processed into an island shape, then the infrared sensor can be manufactured using conventional micro-processing techniques, but the manufacturing process becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent replaces mechanical micro-processing methods with a chemical liquid-phase synthesis method to form quantum dots. This substitution eliminates the need for complex micro-processing steps while achieving the desired quantum dot structure in the light absorption layer, thereby simplifying the overall manufacturing process.
Solution Approach 2:
The patent changes the formation parameters of quantum dots from mechanical micro-processing to chemical synthesis parameters. By controlling synthesis conditions such as temperature, concentration, and reaction time in the liquid-phase synthesis process, the quantum dots are formed directly in the desired configuration without complex micro-processing steps.
2Reliability
If quantum dots are micro-processed into an island shape, then the sensor structure can be formed, but sensitivity decreases or variation increases
Solution Approach 1:
The patent changes the formation parameters from mechanical micro-processing to chemical synthesis parameters. By precisely controlling synthesis conditions such as temperature, concentration, and reaction time in the liquid-phase synthesis process, the quantum dots are formed with high uniformity and consistency, eliminating the variability inherent in micro-processing methods.
Solution Approach 2:
The liquid-phase synthesis method allows quantum dots to self-assemble into uniform structures through controlled chemical reactions. The synthesis process inherently produces consistent quantum dot sizes and distributions without requiring additional precision control steps, improving both manufacturing precision and sensitivity consistency.
3Ease of manufacture
If quantum dots are formed by liquid-phase synthesis method, then the manufacturing process is simplified, but the quantum dot shape must be controlled to be spherical
Solution Approach 1:
The patent controls the quantum dot shape by adjusting synthesis parameters in the liquid-phase synthesis process. By optimizing parameters such as temperature, solvent type, surfactant concentration, and reaction time, the quantum dots are formed with spherical shapes, which provide optimal optical properties for infrared detection while maintaining manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of spherical quantum dots in the infrared sensor optimizes the light absorption layer structure, reducing sensitivity variations and improving detection efficiency.
Implementation Method 1
a step of forming a quantum dot by a liquid-phase synthesis method
Implementation Method 2
a light absorption layer that absorbs an infrared ray
Data Source
AI summary
An object is to provide an infrared sensor with a quantum dot optimized. The present invention provides an infrared sensor (1) including a light absorption layer (5) that absorbs an infrared ray, wherein the light absorption layer includes a plurality of spherical quantum dots (21). Alternatively, the present invention provides an infrared sensor including a light absorption layer that absorbs an infrared ray, wherein the light absorption layer includes a plurality of quantum dots and the quantum dot includes at least one kind of PbS, PbSe, CdHgTe, Ag2S, Ag2Se, Ag2Te, AgInSe2, AgInTe2, CuInSe2, CuInTe2, and InAs.